Put the oil, vinegar, honey, mustard, celery salt and salt and pepper to taste in a mason jar and shake well to combine.
Put the small tomatoes, peaches, large tomatoes, red onions and watercress in a bowl and toss together. Drizzle the vinaigrette down the side of the bowl and gently fold together to combine. Add the cheese and pecans and toss again.
Recipe courtesy of Bobby Flay